Fluorescent luminaire



June 27, 1967 G. J. PICHA 3,328,572

FLUORESCENT LUMINAIRE Original Filed May 5, 1964 7 Sheets-Sheet lINVENTOR George J.Pmhu

{ATTORNEY June 27, 1967 G. J. PICHA 3,328,572

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June 27, 1967 Original Filed May 5, 1964 G. J. PICHA 3, ,572

FLUORESCENT LUMINAIHE 7 Sheets-Sheet 5 June 27, 1967 G. J. PICHA3,328,572

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3,328,572 Patented June 27, 1967 3,328,572 FLUORESCENT LUMINAIRE GeorgeJ. Picha, Cleveland, Ohio, assignor to Westinghouse ElectricCorporation, Pittsburgh, Pa., 21 corporation of PennsylvaniaContinuation of application Ser. No. 364,968, May 5, 1964. Thisapplication June 16, 1966, Ser. No. 560,944 17 Claims. ((11. 240-9)ABSTRACT OF THE DISCLOSURE A luminaire is particularly adapted for usein conjunction with depending beam ceilings so that the cavity formed bythe depending beam construction serves as a luminaire housing. Theluminaire includes an adjustable hanger from which a light diffuser orlight refractor depends. The light diffuser can be readily raised orlowered with respect to the ceiling.

This application is a continuation of copending application Ser. No.364,968, filed May 5, 1964, now abandoned by the present inventor andassigned to the present assignee.

This invention relates generally to luminaires and, more particularly,to luminaires for use with ceiling structures employing depending beams.

With the advent of pro-cast ceiling structures of the depending beamtype construction, there has developed a demand, in the art of spaceconditioning, for lighting and lighting-air, conditioning fixtures whichare tailormade to fit the cavities formed by the depending beams andenhance the aesthetic appearance of the ceiling. Standard fixtures ofthe prior art have proven unsatisfactory in their adaptability toceiling structures of this nature. In addition, with a fixture recessedinto a ceiling cavity, the problem of access to the fixture through theside thereof became aggravated and in some installations very difficultto accomplish. Also because of the many different sizes of ceilingcavities, it is necessary to provide a fixture which can be adapted toprovide a tailor-made appearance when mounted in ceiling cavities ofvarying shapes and sizes. To overcome these disadvantages in the art andstill maintain an economic production cost for the fixture there hasdeveloped a need for a new and unique combination air-conditioning andilluminating fixture for use in ceiling cavities.

It is a general object of this invention to provide a luminaire for usewith ceiling cavities.

A further object of this invention is to provide a luminaire which, whenmounted within a ceiling cavity formed by depending beams, will presenta pleasing aesthetic appearance.

Another object of the invention is to provide a combinationluminaire-air-conditioning fixture which, when mounted in a ceilingcavity, will present a pleasing aesthetic appearance.

Still another object of the present invention is to provide acombination luminaire-air-conditioning fixture which is adapted to bemounted within ceiling cavities of various shapes and sizes.

Yet another object of the present invention is to provide aspace-conditioning fixture which is adjustable in elevation relative toa ceiling.

A further object of the present invention is to provide a luminairewhich has a floating-in-air appearance.

Still another object of the present invention is to provide a luminairefor mounting in a cavity provided by a depending beam structure whereinthe depending beam comprises a part of the luminaire.

The aforesaid objects and other objects which will become apparent asthe description proceeds are achieved by providing an inverted channelwhich may be mounted with its bight portion flush against the mainceiling portion within a cavity. Releasably attached to the ends of thischannel are structural members which support lamp holding means andvertical hanger members for supporting the closure assembly. The closureassembly is light-transmitting. The hangers are telescopicallyadjustable, whereby leveling or adjusting of the closure relative to theceiling may be achieved very simply.

For a better understanding of the nature of the invention, referenceshould be had to the following detailed description taken in conjunctionwith the accompanying drawings, in which:

FIGURE 1 is a perspective view of a ceiling of depending beamconstruction, which is provided with several of the luminaires providedaccording to this in vention;

FIG. 2 is a perspective view of a ceiling having depending beamconstruction, which is provided with combinationlighting-air-conditioning fixtures provided according to this invention;

FIG. 3 is a perspective view of a ceiling employing a different type ofdepending beam construction, and which is provided with several of theluminaires provided according to this invention;

FIG. 4 is a perspective view, partly in section, of a luminaire providedby this invention mounted in a ceiling cavity;

FIG. 5 is another perspective view, partly broken away, of a luminaireprovided by this invention, showing construction details of theluminaire;

FIG. 6 is an end view, partly in section, of a luminaire mounted in aceiling cavity;

FIG. 7 is a side elevational view of two luminaires, mounted end to end,with one partly cut away;

FIG. 8 is a top plan view of two luminaires, mounted end to end;

FIG. 9 is a fragmentary side elevational view of the jointure betweentwo luminaires mounted end to end;

FIG. 10 is a fragmentary end elevation view, partly in section, of aceiling cavity having a luminaire air-conditioning duct and air diffusermounted therein;

FIG. 11 is a side elevational view of the jointure between twoluminaires, end to end, showing an air-conditioning duct and airdiffuser equipped therein;

FIG. 12 is a top plan view of the jointure between two luminaires, endto end, showing the general arrangement of the air-conditioningdiffuser;

FIG. 13 is an end elevational view of a modified form of a luminaire asprovided by this invention, illustrating the closure assembly both inclosed and open position;

FIG. 14 is a perspective view of an end of the luminaire showing adetachable lamp holder support;

FIG. 15 is a fragmentary plan view, partly in section, showing the hingeand latch mounted to the closure;

FIG. 16 is a sectional end elevational view of the closure assemblyshowing the hinge and latch mounted thereto, as taken along linesXVI-XVI in FIG. 15; and

FIG. 17 is a partial side elevational view showing the latch mounted tothe closure.

Throughout the description which follows, like reference charactersrefer to like parts on the various figures.

Referring to the forms of the invention illustrated in the drawings, itcan be seen that the luminaire, when mounted in a ceiling havingdepending beam construction, provides a pleasing aesthetic appearance.FIG. 1 illustrates a room having substantially vertical side walls 30and 32 and a ceiling. The ceiling comprises parallel beams 34 whichdepend therefrom. Several luminaires 36 are mounted between thedepending beams 34 and parallelthereto in tandem fashion.

FIG. 2 shows the luminaire 36 and ceiling of FIG. 1, but with theaddition of an air conditioning dilfuser 38 positioned betwen adjacentends of two abutting luminaires.

FIG. 3 shows a ceiling having not only parallel beams 34 but alsotransverse beams 40 perpendicular thereto, presenting a plurality offour-sided cavities, which as shown, are equipped with luminaires 36.

As shown in FIG. 4, the main ceiling structure 42 and the depending beamstructure 34 define a cavity. Components of the luminaire 36 preferablyare mounted in the cavity, rendering only the light transmitting closureassembly 44 visible from the room space. The light transmitting closureassembly may include a light transmitting member of glass or somesuitable plastic material. The main ceiling 42 and sides 46 and 48' ofthe beams 34 actually serve as the sides or housing of the luminaire36.'The sides 46 and 48 of the beams 34 may be coated with a lightreflective material to assist in directing light through the lighttransmitting closure member 44.

FIGS. and 6 clearly show the construction details of the luminaire 36.An elongated U-shaped channel member 50 having a bight or top wallportion 52 and side walls 54, provides the mainv support for hanging theluminaire 36 from the main ceiling 42. The channel member 50 is affixedto the main ceiling structure 42 by any suitable means such as bolts(not shown). Mounted within the channel member 50 are the electricalcomponents 56 for the luminaire 36. Recessed grooves 53 are provided atthe side walls of the channel to add rigidity. A cover member 60 isremovably attached to the channel '50 by a screw 62 or any othersuitable means. Longitudinally extending grooves 64 are provided in thiscover member to afford a dual function. Not only do the grooves 64 addrigidity to the cover member, but also, being adjacent the turned-inportions 66 of the side walls of the channel, they prevent inwardsqueezing of these side walls. As will be explained subsequently, inwardsqueezing of the side walls elfectuates removal of a lampholder supportmember which is attached to each end of the U-shaped channel member 50.

A downward depending end member 68 is attached to each end of thechannel member 52. The end members 68 are attached to channel member 52by welding, by tab and slot, or any other suitable means. Supportedbetween the end members 68 and mounted thereto are reflectors 70. Thereflectors 70, preferably, are composed of metal, polished on theirlower surface. Conventional lampholders 72, for supporting elongatedlight source means such as fluorescent lamps 74 are mounted to the endmembers 68 adjacent the reflectors by any suitable means.

Located at the ends of the end members 68 are sleeves 76 formedintegrally therewith or fastened thereto. These sleeves 76 are providedwith vertical slots 78. It is to be understood that sleeves 76 of thisor a similar nature may be provided other than at the end points of theend members 68. Adjustable arms 80 are located in the sleeves 76 forvertical adjustment relative to the sleeves 76. A screw 82 insertedthrough slot means 78 is used to secure the position of adjustable arms80 with respect to sleeve means 76. Adjustable arms 80 provide thenecessary adjustment of adjusting the elevation and for leveling closureassembly 44 which is attached to the adjustable arms 80 by means ofhinges and latches which will be discussed subsequently. Alternately,the adjustable arms 00 may be mounted elsewhere on the structuralmembers. As shown in FIG. 6, the closure member or means 44is supportedand suspended solely from the hanger arms or means 80 and all portionsof the closure member 44 are spaced from the beam sides 46 and 48.

FIGS. 7, 8 and 9 show details of adjacent luminaires36 mounted end toend. It can be seen that there is no appreciable gap between theluminaires 36, rendering the appearance one of substantially continuousillumination.

Shown in FIGS. 10, 11 and 12 is another embodiment of the luminaire.Basically, it is identical to the aforementioned embodiment With theaddition, however, of means for providing air-conditioning for the spaceilluminated. There is shown two adjacent luminaires 36 which areprovided, at their junction, with an air-conditioning duct 90 and adiffuser 38. The closure assemblies 44 are designated to receivediffusers 38 and are shaped accordingly. Attachment of the diffuser rimto the closure is by clamps 94 and screws 96 or any other suitablemeans. The

diffuser 38 conventionally is made of metal. However, a translucentmaterial would suflice. The duct is connectable to a branch airtransporting duct. Sufficient flexibility exists in the duct and in theconnections between duct $0, diffuser 38 and closure 44 to permitleveling adjustments of the closure 44. The duct 90 is not visible fromthe room beneath the closure assembly.

FIG. 13 illustrates further, the versatility of the present luminaire.In this embodiment, lampholders 7 2 are adapted to support three, ratherthan two elongated light sources 74-. Accordingly, three reflectors 70are provided. This view shows also the adjustability of the level ofclosure member 44, with the closure member 44 shown alternately in theclosed position and the full open position.

FIG. 14 shows in detail, the structure employed for providing thelampholder suport 04 and channel 52 with means for easily attaching anddetaching a lampholder support 84 to the channel 52 at each end of thechannel 52.

The channel 52 is provided at each end with a pair of notches 10.0 and102 anda pair of tabs 104 and 106'. The ends of the channel 52 are alsoprovided with notches 108 and 110. It is also seen that a tab 112 and114 is turned substantially at right angles to each of the side walls ofthe channel 52. I

The lampholder support 84 comprises a substantially U-shaped memberhaving flanges and 122 turned sub-- stantially at right angles to thesides 124 and 126 of the U-shaped member. The side 124 of the U-shapedmember has a pair of notches 128 and 130 therein. Each of the notches128 and 130 is defined by a cam portion 132, a substantially horizontalportion 134 and a substantially vertical portion 136.

To assemble the lampholder support 84 to the channel 52, the notches 128and 130 of the lampholder support 84 are lined up or mated with the tabs104 and 106 on the channel 52 and the lampholder support 84 is movedupward. This upward movement of the lampholder support 84 will cause thetabs 104 and 106 to slide along the cam portions 132 of the slots 128and 130 in the side 124 of the lampholder support 84. As the lampholdersupport 84 is moved further upward the tabs 104 and 106 will finallysnap under the substantially horizontal portions 134 of the slots 128and 130 in the side 124 of the lampholder support 84. In this positionof the lampholder support 84, the notches 108 and 110 in the side wallsof the channel 84 andthe turned in portions 112 and 114 of the sidewalls of the channel 52 rest firmly on the lampholder support 84. Thelampholder support 84 is in this manner firmly attached to the channelmember 52.

To detach the lampholder support 84 from the channel member 52 forservice, or other purposes, it merely requires that the tabs 104 and 106be squeezed toward each other until they clear the substantiallyhorizontal portions 134- of the slots 128 and 130'. The lampholdersupport 84 may then be detached from the channel 52. Accidentalsqueezing of the tabs 104 and 106 to cause detaching of the lampholder84from the channel 52 is pre- "vented by the grooves 64 which are clearlyillustrated in FIG. 13. In order to remove the lampholder support 84from the channel 52 sufficient pressure must be applied to the tabs 104and 106 to cause the tabs to ride over the inclined outer surfaces ofthe grooves 64. The grooves 64 are of sufiicient depth to prevent thetabs from accidentally riding up on the inclined outer surface of thegrooves 64. It is understood that a lampholder support 84 is attached ina like manner to both ends of the channel member 52.

FIGS. 15, 16 and 17 illustrate details for the closure assembly 44,hinge and latch mechanism. The closure 44 pivots about hinge pins 140which are attached to the closure assembly 44. The hinge pins 140 restson a bearing portion 142 provided on members 144 which are attached tothe adjusting arms 80. The hinge pins 140 may be molded integrally withclosure 44 or fastened thereto by any other suitable means. It isfurther to be understood that bearing portions 142 may be provided onthe member 144 on both sides of the luminaire 36 so that the closureassembly 44 may be reversed. Likewise, a latching member 148 may beattached to the closure assembly 44 for latching the closure assembly 44in closed position. The latching member 148 engages one of the members144 to hold the closure assembly 44 in closed position.

It can be seen therefore that by manufacturing a standard channel,ballast and cover assembly of the type herein described, a luminaire canbe installed in a ceiling cavity of various dimensions. By providing theproper size light transmitting closure assembly, structural member andlampholder support, which are all readily attachable, a versatilestructure is provided which utilizes the ceiling and sides of thedepending beams to comprise part of the luminaire.

, Cleaning the inside of the assembly is accomplished simply byunlatching the closure assembly and dropping it down to a verticalposition. If further maintenance is required, the closure assembly mayeasily be removed from its supporting structure. In addition replacementof electrical components is facilitated because of the suspension-typeinstallation thereof.

From the foregoing description, it is apparent that the objects of theinvention have been achieved by providing a luminaire which may bemounted within a ceiling cavity formed by depending beams with thedepending beams comprising a part of the luminaire. Manufacture of thefixture is simple. The luminaire is equipped to receive air conditioningdispensing means. It has versatility in that it can be adapted to fitvarious size cavities. It also possesses easy access features andadjustability.

Since numerous changes may be made in the above described constructionand different embodiments of the invention may be made without departingfrom the spirit and scope thereof, it is intended that all subjectmatter contained in the foregoing description or shown in theaccompanying drawings shall be considered as illustrative and not in alimiting sense.

I claim as my invention:

1. The combination luminaire which comprises:

(a) luminaire housing means comprising a top wall portion and side wallportions depending therefrom;

(b) supporting means positioned within and affixed to said housingmeans;

(c) lampholders supported within said housing means --by said supportingmeans and adapted to support elongated light sources within said housingmeans;

(d) hanger means affixed to said supporting means and extendingdownwardly therefrom within said housing means; and

(e) at least one light-transmitting closure means supported andsuspended solely from said hanger means and positioned within saidhousing means, all portions of said closure means spaced inwardly fromsaid depending side wall portions, and said closure means being readilymovable to permit access to the interior of said housing means.

2. The combination as specified in claim 1, wherein said luminairehousing means is formed by part of a ceiling, said top wall portion ofsaid housing means comprises an upper portion of said ceiling, and saidside wall portions of said housing comprise ceiling-beam portions ofsaid ceiling which depend from said upper portion of said ceiling.

3. The combination as specified in claim 2, wherein said supportingmeans is affixed to said upper ceiling portion and is renderedsubstantially unobservable by said at least one closure means whenviewed from below.

4. The combination as specified in claim 3, wherein said at least oneclosure means is positioned within said housing means above the lowerextremities of said depending ceiling-beam portions.

5. The combination as specified in claim 4, wherein said hanger means isadjustable to different lengths to permit leveling of said at least oneclosure means.

6. A luminaire adapted for use in a ceiling structure having dependingbeams defining cavities therebetween, said luminaire comprising:

(a) an elongated, inverted, generally U-shaped channel member having abight portion and downwardly extending side wall portions defining abottom opening and end openings, the ends of said side wall portionsprovided with slotted means for engaging lampholder support means;

(b) elongated cover means attached to said channel and enclosing saidbottom openings, said cover means provided with inverted, elongated,upwardly projecting V-shaped groove adjacent said side wall portions,said grooves preventing inward squeezing of said side wall portions;

(c) U-shaped lampholder support means having side wall portions providedwith notches, said notches interfitting with said slotted means saidsupport means releasable from said channel member by a slight inwardsqueezing of said channel side wall portions after said cover means isremoved from said channel member;

((1) at least one lampholder secured to each said sup port means, saidlampholders adapted to support elongated light source means;

(e) structural means, aflixed to opposite ends of said channel andextending laterally of said channel;

(f) adjustable means depending from said structural means; and

(g) light transmitting closure means attached to said adjustable meansand suspended therefrom.

7. A luminaire adapted for use in a ceiling structure having dependingbeams defining cavities therebetween,

said luminaire comprising:

(a) an elongated, inverted, generally U-shaped channel member having abight portion and downwardly extending side Wall portions defining abottom opening and end openings, the ends of said side wall portionsprovided with slotted means adapted to engage lampholder support meansof various dimensions, and said channel member also adapted to supportstructural means of various dimensions;

(b) elongated cover means enclosing said bottom opening, said covermeans provided with inverted, elongated, upwardly projecting V-shapedgrooves adjacent said side wall portions, said grooves preventing inwardsqueezing of said side wall portions;

(0) U-shaped lampholder support means having side walls provided withnotches, said notches interfitting with said slotted means, said supportmeans releasable from said channel member by a slight inward squeezingof said channel side wall. portions when said cover means is removedfrom said channel member;

(d) at least one lampholder secured to each said support means, saidlampholders adapted to support elongated light sources;

(e) structural means afiixed to opposite ends of said ends of saidchannel and extending laterally of said channel;

1 (f) adjustable means attached to and depending from said structuralmeans, said adjustable means adapted to assume any of a plurality oflengths;

(g) light transmitting closure means attached to said adjustable means,said closure means being of a size to substantially enclose said cavityand render unobservable other, portions of said luminaire.

8. A luminaire adapted for use in a ceiling structure having dependingbeams defining cavities therebetween, said luminaire comprising:

(a) an elongated, inverted, generally U-shaped channel member having abight portion of downwardly extending side wall portions defining abottom opening and end openings, the ends of said side Wall portionsprovided with mating means for engaging lampholder support means;

(b) elongated cover means enclosing said bottom openings, said covermeans provided with inverted, elongated, upwardly projecting V-shapedgrooves adjacent'said side wall portions, said grooves preventing inwardsqueezing of said side wall portions;

(c) U-shaped lampholder support means having side walls provided withnotches, said notches interfitting with said mating means, said supportmeans eleasable from said channel member by a slight inward squeezing ofsaid chanel side wall portions when said cover means is removed fromsaid channel, and said channel means serving as a raceway for Wiring between electrical components of said luminaire;

(d) at least one lampholder secured to each said support means, saidlampholders adapted to support elongated light source means;

(e) structural means afiixed to opposite ends of said channel andextending laterally of said channel;

(f) adjustable means depending from said structural means; and

(g) light transmitting closure means releasably hinged and latched tosaid adjustable means.

9. A luminaire adapted for use in a ceiling structure having dependingbeams defining cavities therebetween, said luminaire comprising:

(a) an elongated, inverted, generally U-shaped channel member having abight portion and downwardly extending side wall portions defining abottom opening and end openings, the ends of said side wall portionsprovided with mating means for engaging lampholder support means, andsaid channel member adapted to support structural means of variousdimensions;

(b) elongated cover means enclosing said bottom opening, said covermeans provided with inverted elongated, upwardly projecting V-shapedgrooves adjacent said side wall portions, said grooves preventing inwardsqueezing of said side wall portions;

(c) U-shaped lampholder support means having side wall portions providedwith notches, said notches interfitting with said mating means, saidsupport means releasable from said channel member by a slight inwardsqueezing of said channel side wall portions;

(d) adjusting means supported by said lampholder support means; and

(e) closure means releasably hinged to said adjusting means, saidadjusting means adapted to permit leveling of said closure means, andsaid closure means being of size to substantially cover said cavitiesand render unobservable other portions of said luminaire.

10. A luminaire adapted for use in a ceiling having portions whichdepend from the main ceiling structure, with luminaire-retainingcavities defined by said depending portions and said main ceilingstructure, said luminaire comprising:

(a) an elongated, inverted, generally U-shaped channel member having abottom opening and adapted to be affixed at its upper side to said mainceiling structure intermediate a pair of said depending portions;

(b) cover means enclosing said bottom opening;

(c) lampholder support means attached to opposite ends of said channelmember;

(d) at least one lamphold'er secured to each said lampholder supportmeans and adapted to support elongated light source means;

(e) structural means afiixed to opposite ends of said channel memberproximate said lampholder support means and extending laterally of saidchannel said lampholder support means comprises a raceway forv wiringbetween electrical components of said luminaire, and said lighttransmitting closure means is releasably hinged and latched to saidadjustable means.

12. A luminaire in combination with a ceiling, said ceiling having amain portion and portions depending downwardly therefrom, the surfacesof said main ceiling portion and said ceiling depending portions forminga plurality of housings adapted to receive luminaires, said luminairemounted within one of said ceiling-formed housings, said luminairecomprising:

(a) an elongated inverted channel member afiixed to said main ceilingportion between an adjacent pair of said ceiling depending portions;

(b) support members attached to said channel member proximate oppositeends thereof and extending within said one ceiling-formed housingtransversely of said channel member;

(c) at least one lampholding means secured to each said support membersand adapted to support elongated light source means within said oneceilingformed housing;

(d) hanger means aflixed to and depending from said support member, saidhanger means adjustable to difierent lengths; and

(e) a light transmitting closure member suspended by said hanger meansand positioned generally parallel to said main ceiling portion andgenerally within said one ceiling-formed housing and extending between asubstantial portion of the space between said adsaid light transmittingclosure member readily movable to permit access to the light sourcemeans.

13. The luminaire as specified in claim 12, wherein said ceilingdepending portions are disposed in parallel relationship, and saidelongated inverted channel member is adapted to be disposed paralleltherewith.

14. The luminaire as specified in claim 12, wherein a cover member isdisposed over the open bottom of said elongated inverted channel member.

15. The luminaire as specified in claim 12, wherein-an air duct means isprovided within said ceiling housing, and an air diflfuser meansis'connected to said duct means and opens into the space to beilluminated by said luminaire.

16. The luminaire as specified in claim 12, wherein the surfaces of saidceiling are at least partially coated With a light reflective materialto assist in directing light through said light transmitting member.

17. A plurality of luminaires in combination with a I ceiling formed byportions depending from a main upper portion, the surfaces of saiddepending portion and said upper portion forming a plurality of housingsforsaid plurality of luminaires, at least two of said luminaires mountedin end-to-end abutting relationship within one of said ceiling-formedhousings, said luminaires each comprising:

jacent pair of said ceiling depending portions, and

(a) an elongated channel member afiixed to said main ceiling portionbetween and generally parallel to an adjacent pair of said ceilingdepending portions;

(b) at least two support members attached to said channel member andextending Within said one ceiling-formed housing transversely of saidchannel member and said depending portions;

(c) at least one lampholding means secured to each said support memberand adapted to support elongated light source means Within said oneceilingformed housing;

((1) hanger means affixed to and extending from said support members;

(e) a light transmitting member movably suspended by said hanger meansgenerally parallel to said main ceiling portion and positioned generallyWithin said one ceiling-formed housing; and

(f) air transporting means and dilfusing means afiixed at the end ofsaid luminaire, said difiusing means substantially flush with said lighttransmitting member and substantially sealingly engaged therewith.

References Cited UNITED STATES PATENTS Johnston 240-51.11 Beals et al.240-51.11 Krauss 240-5 1.11 Potter 240-51.11 Krauthemer 240-51.11 Stubbs240-51.11 Wakefield 240-9 Zurauski 240-51.11 Lipscomb 240-9 NORTONANSI-1BR, Primary Examiner. R. M. SHEER, Assistant Examiner.

1. THE COMBINATION LUMINAIRE WHICH COMPRISES: (A) LUMINAIRE HOUSINGMEANS COMPRISING A TOP WALL PORTING AND SIDE WALL PORTION DEPENDINGTHEREFROM; (B) SUPPORTING MEANS POSITIONED WITHIN AND AFFIXED TO SAIDHOUSING MEANS; (C) LAMPHOLDERS SUPPORTED WITHIN SAID HOUSING MEANS BYSAID SUPPORTING MEANS AND ADAPTED TO SUPPORT ELONGATED LIGHT SOURCESWITHIN SAID HOUSING MEANS; (D) HANGER MEANS AFFIXED TO SAID SUPPORTINGMEANS AND EXTENDING DOWNWARDLY THEREFROM WITHIN SAID HOUSING MEANS; AND(E) AT LEAST ONE LIGHT-TRANSMITTING CLOSURE MEANS SUPPORTED ANDSUSPENDED SOLELY FROM SAID HANGER MEANS AND POSITIONED WITHIN SAIDHOUSING MEANS, ALL PORTIONS OF SAID CLOSURE MEANS SPACED INWARDLY FROMSAID DEPENDING SIDE WALL PORTIONS, AND SAID CLOSURE MEANS BEING READILYMOVABLE TO PERMIT ACCESS TO THE INTERIOR OF SAID HOUSING MEANS.